That's the first I've heard of that problem. That may be a manufacturing defect. Can you attach a pic?

Scottie J

hey sorry for the slow response, gonna revisit the bike soon and I'll get a pic.It's got a problem now where it's kickin a lot of oil out of the airbox breather, coming up the breather hose. oil is turning dark very fast and level keeps going down. Even when the level is below the minimum in the window (when hot) it still will kick out oil through the breather hose. I found some tips to fix this for the carbureted models but not the EFI model. Gonna post a new thread if I can't find anything in the search, if you have any ideas on solutions or diagnostics I'd be very very grateful!

I've never heard of a UCE engine spitting oil out of the breather unless the engine was overfilled. The old Iron barrels and AVL, yes but not on the UCE engines.

Are you checking the oil level with the motorcycle resting on the side stand?The only way to properly check it is to have the motorcycle on the center stand, resting on a level surface.

Even then, it will show a false reading unless the engine is started and allowed to run for at least 10 seconds. This allows the oil in the side cases to flow back into the main oil tank and sight guage area so a accurate reading can be made.

I removed the right engine cover and replaced the gasket....Today I reinstalled everything except the exhaust and I tried starting it up to let it idle a few seconds. I guess I was doing this to circulate the oil and see if 2.2L was enough to read correct in the oil window.

Too much oil. I usually wind up with just under 2 quarts. You put in almost 2 1/2. When you had the right side cover off to replace the gasket, did you also replace the gasket on the breather chamber, inside the right side cover... That MAY have been the leak? And MOST importantly, did you reinstall the O ring on the inlet side of the oil pump inside the right side cover, and or replace it if in bad shape? If oil can't circulate.... An oil plugged air filter is also something you could look at....

Thanks for all the replies!When I first worked on the bike the oil level was VERY low and very black. It was supposed to be within it's change schedule. The magnet on the drain bolt had a good bit of fuzz on it, no chunks no hunks, just fine sludgey goo of magnetic particles. None of this was very good, in my opinion, but I didn't know what to make of it yet. I didn't have a detailed maintenance record or anything like that.Ordered a complete gasket set and opened up the right side cover because there were bits of gasket coming out and oil leaking over the swingarm, chain, inside the rear fender, all over back wheel. this is characteristic of oil coming out the airbox but I didn't check it then. The gasket bits were no big deal, just extraneous bits around the drive sprocket cover if you know what I mean....So I did overfill at first, it was hard to gauge, and info online stated anywhere from just under 2L to 2.3L...A few days later I checked the oil while hot on the centerstand, and it wasn't showing up in the window. So I added a bit more and the next day it pushed it out the breather again and the level was back juuuust under the window. I left it as is, and there was very little oil coming out, but after a week I checked the bike (it's my friend's bike that I'm trying to maintain for him) and the oil level was too low for my comfort and looking pretty black, so I added some more and it spit it out.I have since learned about the oil/air labyrinth and the gasket in the breather chamber, and I'm very eager to get it opened up to see what's going on in there.I will check for the oil pump o-ring when I'm in there as well. I have some oil change kits on order and I'll sort it out when they come in.The air filter looked fine, but I will check it again. It has a plastic cover over it that the dealer added at some point after purchase, it seems that it's trying to direct air from the little vent in the back of the airbox directly to the filter, but it also keeps the oil off.

Is the oil pump system the same on the UCE bikes as it is the old Iron barrels? As in the oil pumps are operated off of a worm gear and there is a pressure/feed pump and a scavenge/return pump? If it is then you might have the problem I ran into last year. My bike kept spitting ALL the oil out of the crank breather. It turned out that a PO had used an excessive amount of silicone on one of the gaskets, the silicone had broken away from the seam it was used on and made it's way through the oiling system. It stopped when it reached the timing cover and completely blocked off the scavenge/return pump oil passages. So the bike was pumping oil thru the engine, but the flow stopped when it reached the crank valley and just started dumping it out the back in a messy and sketchy fashion. I pulled the timing cover off, removed the silicone pieces and blew out all of the passages with compressed air and have since added a duckbill breather.

Thanks for all the replies!When I first worked on the bike the oil level was VERY low and very black. It was supposed to be within it's change schedule. The magnet on the drain bolt had a good bit of fuzz on it, no chunks no hunks, just fine sludgey goo of magnetic particles. None of this was very good, in my opinion, but I didn't know what to make of it yet. I didn't have a detailed maintenance record or anything like that.Ordered a complete gasket set and opened up the right side cover because there were bits of gasket coming out and oil leaking over the swingarm, chain, inside the rear fender, all over back wheel. this is characteristic of oil coming out the airbox but I didn't check it then. The gasket bits were no big deal, just extraneous bits around the drive sprocket cover if you know what I mean....So I did overfill at first, it was hard to gauge, and info online stated anywhere from just under 2L to 2.3L...A few days later I checked the oil while hot on the centerstand, and it wasn't showing up in the window. So I added a bit more and the next day it pushed it out the breather again and the level was back juuuust under the window. I left it as is, and there was very little oil coming out, but after a week I checked the bike (it's my friend's bike that I'm trying to maintain for him) and the oil level was too low for my comfort and looking pretty black, so I added some more and it spit it out.I have since learned about the oil/air labyrinth and the gasket in the breather chamber, and I'm very eager to get it opened up to see what's going on in there.I will check for the oil pump o-ring when I'm in there as well. I have some oil change kits on order and I'll sort it out when they come in.The air filter looked fine, but I will check it again. It has a plastic cover over it that the dealer added at some point after purchase, it seems that it's trying to direct air from the little vent in the back of the airbox directly to the filter, but it also keeps the oil off.

I suppose a compression test is in the cards.

Yeah.... If you don't remember seeing that O ring, or dealing with it and such? IMHO, pull that cover and make sure ! It's too important, not to be sure. You would loose oil pressure if it's not there or in bad shape. I could also imagine that MAYBE, with the oil not circulating like it should, and just accumulating in the case, it could get blown out the vent. Probably not a bad idea to ask your buddy NOT to ride the bike until you could have a look, JUST in case.

When you put the right side gasket cover back on... or a new one. There is absolutely no need for Permatex, three bond or gooey stuff and etc. Just a light coat of oil or grease. It's a good matting surface between the cover and case, and there should be no need for it. And will make taking it apart later MUCH easier. UNLESS , the surfaces have been damaged already. There are very small oil passages that can be easily blocked if bits of that crap gets loose..... might even wind up in a lifter !

There is also a oil passage that you want to be aware of behind the cover, it is on the top and just to the left and below the lifter inspection cover. It's a whole next to one of the side cover mounting bolt holes... it is NOT threaded. Make SURE it is clear, you may wont to blow a bit of compressed air through it. And also make sure the hole on the corresponding side of the cover is clear.

When you refill with oil after a change..... just put in the first quart. Then slowly add the second one as you watch the sight glass. And bring it up to the bottom third to one half of the sight glass and call it good... there is still a little bit of oil still in there.

If you doing a compression test..... do it with a fully charged battery, so you can spin the motor over fast enough to defeat the auto decompressor on the exhaust cam. Fuel pump disconnected...unplugged. And throttle wide open and hit the start button. The starter will spin it over , without the fuel pump connected. Bike in neutral, on center stand, side stand up.

I didn't recall him saying he removed the oil pump and if he didn't, he wouldn't see the O-ring that's under it.

No, Scottie. The oil pump on the UCE is entirely different than the oil pump on the Iron Barrels.The UCE uses a modern gerotor pump instead of two piston pumps. It also does not have a scavenge/return pump. The UCE pump just pulls oil from the oil "tank" (sump) and supplies it to the filter cartridge.From the filter the oil is distributed to the right end of the crankshaft, to the hydraulic valve lifters and to the rocker arms.Oil going to the lifters and the rocker arms drains by gravity down to the cams and drive gears and back to the oil tank (sump).

Oil going thru the crankshaft lubes the bearings, piston and rings. As it collects in the bottom of the crankcase, the flywheels on the crankshaft pick it up and throw it back onto the gears in the transmission.After lubing the gears and gearshafts it drains by gravity back into the oil tank (sump).

Just want to confirm you're checking the oil level correctly. When you say you checked it "hot", how hot? How long had it been running? In my experience anything less than actually riding it for 20 minutes or more and the oil isn't really hot and won't flow engough to read it easily. Running the engine on the stand and sitting there doesn't count.

Anyway, once it's really hot stop the engine and immediately put it on the center stand on level ground. Let it sit for a full five minutes. THEN go look in the site glass and see where the level is.

If you just ride the bike for a few minutes and the oil isn't really hot, it won't flow over to the site glass. It will just sit up in the engine's nooks and crannies and appear to be low when it isn't. If you top up it will be an overfill and it will likely puke oil all over the place.

I agree with your warm up comments Scotty but I think you forgot to mention that after the warmed motorcycle has rested on its center stand the engine needs to be restarted and allowed to idle for at least 30 seconds.

That will pump the excess oil in the left sidecover back into the oil tank so it will show up in the sight glass.

Yes Que es MUY importante ! A bad seal between IT and the back of the oil filter housing on the cover. NOT good..... Sometimes when you pull the cover, you find it in place on the end of the pump, sometimes on the back side of the cover, sometimes it falls on the floor. Before I put the cover back on, I stick it on the pump (new one) with some grease to hold it in place, then carfully watch it as I eaaase the cover on.

A bad seal... or no seal between the pump and the filter would reduce pressure , or No pressure! Out to the lifters, the cylinder, the head, the pushrod tips, the valve stems, the rockers, through the crank shaft to the big end, and etc. It's an important little O ring ! As you mentioned....

A bad seal or no seal, and the oil would pour or spray out between the pump and filter housing ...side cover...and accumulate in the side cover and sump. AND near or in the breather chamber. Excess oil that is, because it is not going where it is supposed to be, or in a reduced amount. Add in some normal ring blow by, and positive pressure in the case....... out the vent it goes. Just a thought.